Kutheni Ezi Ziphene Zihlala Zivela Kwimveliso

Kwiinkqubo zokubumba kunye nokubumba nge-polyurethane,imingxunya yemingxuma, imingxunya yokuncipha, kunye neempawu zokuhambaziphakathi kweziphene zomphezulu eziphindaphindayo rhoqo kwiinkqubo ze-polyurethane eziguquguqukayo neziqinileyo.

Kwanasemva kokulungiswa okuphindaphindiweyo, ezi ngxaki zihlala ziphinda zivele, nto leyo ebonisa ukuba unobangela oyintloko awusoloko uyimpazamo enye yokusebenza. Endaweni yoko, zivela kwi-ukungalingani kwinqanaba lenkqubokuquka:

• Ulawulo lokufuma kwezinto eziluhlaza
• I-kinetics ye-reaction (ibhalansi ye-foaming vs i-gelation)
• Ukulinganisa kunye nozinzo lokuxuba
• Uyilo lokufaka umoya kunye noyilo lokuzalisa isikhunta
• Ulawulo lobushushu benkqubo

Ukuze imveliso ihlale izinzile, i-inkqubo yokwenza i-polyurethanekubalulekile.

Funda ngakumbi malunga neenkqubo ezilungiselelwe usetyenziso olwahlukeneyo:
Izisombululo zeNkqubo yePolyurethane

---

1. Iimingxuma (ii-Micro Voids, ii-Fine Porosity, ii-Blood-Holes)

1.1 Izizathu Eziphambili Zokuphinda Kwenzeke

(1) Ungcoliseko loMfutho — Unobangela oPhambili

Ukufuma kwi-polyols, ii-catalysts, ii-surfactants ze-silicone, okanye izongezo zezona zinto zixhaphakileyo ezibangela imingxuma.

Imithombo ephambili ibandakanya:

• Ukufunxwa kwezinto eziluhlaza nge-hygroscopic
• Ukufuma kwiitanki zokugcina
• I-Isocyanate hydrolysis
• Iimolds ezimanzi okanye ii-agents zokukhulula amanzi
• Umswakama ophezulu ojikeleze umhlaba

Amanzi aphendula nge-isocyanate (NCO) ukuvelisa igesi ye-CO₂. Ukuba amaqamza awakwazi ukuphuma ngaphambi kokuba kufakwe i-gel,imingxunya yemingxuma itshixelwe ngokusisigxina kwisakhiwo.

Iifomyula ezinobuthathaka kumswakama zifuna uyilo lwenkqubo oluphuculweyo:
Indlu yeNkqubo yePolyurethane

---

(2) Ukuvalelwa Komoya Ngexesha Lokuxuba

• Isantya sokuxuba esigqithisileyo
• Ukuphakama okuphezulu xa kugalelwa
• Uyilo lwentloko yokuxuba oluxokozelayo

Ezi meko zizisa amaqamza omoya omncinci angenakuphuma ngexesha.

---

(3) Ukungalingani kweGelation kunye neFoam

• Ukugeleza ngokukhawuleza kakhulu → amaqamza abanjwe eludongeni oluqinileyo
• Ukugqabhuka kwegwebu ngokukhawuleza kakhulu → ukugqabhuka kweqamza
• Ukuhambelana okungalunganga kwe-silicone surfactant → isakhiwo seseli esingazinzanga

Ukukhethwa kweCatalyst kudlala indima ebalulekileyo ekulinganiseni isantya sokusabela:
IiCatalysts zePolyurethane Amine

---

(4) Iziphene zokukhupha umoya kwi-mold

• Iitshaneli zomoya ezivaliweyo
• Uyilo olubi lwemibhobho yomoya
• Umoya wokubamba umoya ovalwe ngaphambi kwexesha

---

1.2 Izisombululo zoBunjineli

• Phucula ukutywinwa kwezinto eziluhlaza kunye nokubeka iliso kumswakama
• Sebenzisa ukhuseleko lwe-nitrogen kwiindawo ezifumileyo
• Fudumeza kwaye womise iimbombo ngokufanelekileyo
• Lungiselela amandla okuxuba kwaye unciphise ukungena komoya
• Lungisa ibhalansi ye-amine/tin catalyst ukuze kubekho ixesha elizinzileyo lokuphendula
• Phucula uyilo lokukhupha umoya kunye nolandelelwano lokuvala isikhunta

---

2. Iingxangxasi zokuNciphisa (Iimpawu zokuSinki, ukuQhoboza komphezulu, ukuNciphisa komphetho)

2.1 Izizathu Eziphambili Zokuphinda Kwenzeke

(1) Ukugqithisa kakhulu emva kokuncipha

• Uxinano oluphantsi lwe-crosslink
• Isalathisi se-NCO esiphantsi
• Umlinganiselo wokwandiswa kwefoam ephezulu

Kukhokelela ekucuthekeni kwangaphakathi emva kokuphola kunye nokudilika komphezulu.

---

(2) Ukusasazwa kobushushu okungalinganiyo kunye noBushushu

• Iindawo ezityebileyo ziyaphola kancinci kuneendawo ezincinci
• Umahluko woxinzelelo lwendawo
• Ukungangqinelani koxinano kulo lonke icandelo

---

(3) Ukuzaliswa okunganelanga okanye uyilo olubi lwesango

• Imingxuma engazaliswanga kakuhle
• Ukufikelela kakubi kokuhamba kwamanzi kwiindawo ezisekupheleni
• Ukubekwa kwesango lokujova ngendlela engalunganga

---

(4) Ukudilizwa Kwangaphambi kwexesha

Ukudilika kwangoko kukhokelela ekuweni kwesakhiwo ngenxa yokungalungiswa ngokupheleleyo kwangaphakathi.

---

2.2 Izisombululo zoBunjineli

• Nyusa kancinciIsalathisi se-NCO (uluhlu lwe-1.05 → 1.10)
• Yenza ngcono ubunzima bomfanekiso kwaye uqinisekise ukugcwala okuncinci
• Ukulinganisela ubushushu bokubumba kunye nobushushu bezinto eziphathekayo
• Yandisa ixesha lokupholisa ngaphambi kokuba unciphise
• Phucula ibhalansi yokwenziwa kwefomyula usebenzisa ukulungiswa kwinqanaba lenkqubo

Inkxaso yokwenza ngcono inkqubo:
Izisombululo zeNkqubo yePolyurethane

---

3. Iimpawu Zokuhamba (Imigca Yokuhamba, Imigca Yokuwelda, Imigca, Amaza Omphezulu)

3.1 Izizathu Eziphambili Zokuphinda Kwenzeke

(1) Ukuhamba Kokuzalisa Okungagungqiyo

• Ukutshintshatshintsha koxinzelelo lwepompo
• Ukungazinzi komlinganiselo wokulinganisa
• Ukuhamba kwenaliti okuguquguqukayo

---

(2) Ukungalingani kobushushu

• Ubushushu obuphantsi bomngundo bubangela ulusu olukhawulezileyo
• Ukudibana kakubi kwee-flow fronts
• Ukutshintshatshintsha kobushushu kubangela iziphene ezingaguquguqukiyo

---

(3) Uyilo lweSango olubi

• Isango elinye elinomzila omde wokuhamba kwamanzi
• Iiflethi ezininzi zeflow flow ezenza imigca ye-weld
• Ukutsiba okubangelwa bubungakanani besango elincinci

---

(4) Iingxaki zokungahambi kakuhle kwamanzi/iingxaki ze-Agent yokukhulula

• Ukuhamba kakuhle kwefomyula
• Ukwambatha kwearhente yokukhulula okungalinganiyo
• Ungcoliseko lomphezulu oluthintela ukudibana

---

3.2 Izisombululo zoBunjineli

• Zinzisa iinkqubo zokulinganisa kunye nokumpompa
• Gcina ubushushu obufanayo bokubumba kunye nezinto
• Yongeza iindawo zokufaka inaliti ezincedisayo kwimingxuma emide
• Phucula ukuhamba kakuhle usebenzisa uhlengahlengiso lwefomula

Phucula ukusebenza kokuhamba kwenkqubo ngezithako ezifanelekileyo:
Izinto ezithintela ilangatye kunye nezisombululo ezongezelelweyo

---

4. Isakhelo sokusombulula iingxaki ngendlela ecwangcisiweyo

Xa iziphene zisenzeka ngokuphindaphindiweyo, sebenzisa le ndlela yokuxilonga ecwangcisiweyo:

Inyathelo 1: Ulawulo lweNdalo

• Uzinzo lobushushu kunye nokufuma
• Amanqanaba okufuma kwezinto eziluhlaza
• Iimeko zokuvala zokugcina

Inyathelo lesi-2: Ukuhlolwa kweNkqubo yokuMitha

• Ukuhambelana komlinganiselo we-A/B
• Uzinzo loxinzelelo lwepompo
• Ukuguquguquka kwesantya sokuhamba kwamanzi

Inyathelo lesi-3: Ukuhlolwa kweNkqubo yoKusabela

• Ibhalansi yobushushu bezinto kunye nokungunda
• Ukukhethwa kwenkqubo yeCatalyst
• Ixesha lokukhupha igwebu xa kuthelekiswa nexesha lokufaka igwebu

Inyathelo lesi-4: Ukujonga Inkqubo yeMold

• Uyilo lokungenisa umoya
• Uyilo lwesango
• Ukufana kwearhente yokukhulula
• Ukunciphisa ixesha

Inyathelo lesi-5: Ukungaguquguquki kokusebenza

• Ukumisela indlela yokuxuba
• Ulawulo lobuchule bokuthulula
• Ukuchaneka kobunzima beshot

---

Isiphelo

Imingxunya yemingxuma, imingxunya yokuncipha, kunye neempawu zokuhamba kwamanzi azizo ziphene ezahlulwe zodwa — zinjaloiimpawu zokungalingani kwenkqubo kuyo yonke indlela yokwenza izinto, inkqubo, kunye noyilo lwesikhunta.

Imveliso ye-polyurethane ezinzileyo ifuna ulawulo oluhambelanayo lwe:

• Umgangatho wezinto eziluhlaza
• I-kinetics yempendulo
• Inkqubo ye-Catalysis
• Ubunjineli bokubumba
• Inkqubo yokuziphatha

Ukuze isebenze kakuhle kwaye inciphise amazinga eziphene, i-design eyilwe ngokufanelekileyoisisombululo senkqubo ye-polyurethanekubalulekile.

Nxibelelana neqela lethu lobuchwephesha ukuze ufumane ulungelelwaniso olulungiselelwe wena, ukhetho lwe-catalyst, kunye nenkxaso yenkqubo:

Indlu yeNkqubo yePolyurethane